Wet exhaust hose - 50mm ID. Any recommendations?

RichardS

RichardS

N/A
Joined
5 Nov 2009
Messages
29,212
Location
Home UK Midlands / Boat Croatia
Visit site
The "Shakedown" thread on Scuttlebutt explains about my exhaust hose suddenly spraying water everywhere over the engine.

The hose fitted at the moment is made by Megaflex and the one thing it is not is flexible. I have thought about binding it with self-annealing tape, at least as a temporary measure, but I can foresee that the main problem is going to be getting the 2m length out of the engine compartment which I will need to do to tape it. I realise that taping the hose is not ideal but my engine compartments are separate and well aft any cabins so it's not too bodgy, although it would be good to get the job done and finished and hopefully with something that lasts a bit longer as the Megaflex hose is stamped Q4 2007 which seems a poor show.

I've just looked at the51mm Seaflow hose sold by ASAP and that says that it is very flexible so should be a lot easier to get back in than this MegaNonFlex stuff, assuming that the Seaflow is actually any better.

I changed all my toilet hose from stiff PVC stuff to lovely rubbery stuff bought from ASAP a couple of years ago and I would like to pull the same trick again with the exhaust hose, at least on the port engine.

Can anyone advise me whether the Seaflow stuff will deliver on its promise or is there anything better?

Thanks. :)

Richard
 
Had good results with hose from Vetus and Halyard Marine. Both very flexible and meet all relevant standards.
 
When I had a leak in my exhaust hose about a foot from the manifold, rather than replace the whole hose I got a SS elbow made and just replaced a meter of hose from manifold to new elbow, on the principle that they nearly always go up near the manifold, so to carry a spare meter for the next time it happens (middle of Biscay last time) is no issue.
 
It's now 11 yrs since I re-engine but I believe I used the hose from ASAP - as I got a lot of stuff from them at the time and from memory it was flexible enough for my installation.
 
ASAP only seem to sell Seaflow and not Vetus unless I'm not searching the site properly. When I started the search I'm sure Vetus was listed but I looked through 2 pages and couldn't see any Vetus. :confused:

I'll try some other sellers for comparisons when I'm back home.

Richard
 
LadyInBed said:
When I had a leak in my exhaust hose about a foot from the manifold, rather than replace the whole hose I got a SS elbow made and just replaced a meter of hose from manifold to new elbow, on the principle that they nearly always go up near the manifold, so to carry a spare meter for the next time it happens (middle of Biscay last time) is no issue.
Click to expand...

My leak is in the long run from the water trap to the skin fitting and it goes right up across and above the engine then down the other side. The leak is in the middle at the highest point so the only way to fix it other than tape would be with a 50mm OD SS straight pipe stub in the middle and two clips. That will make it even less flexible than it is at the moment I think so I've rather discounted the idea.

Richard
 
RichardS said:
My leak is in the long run from the water trap to the skin fitting and it goes right up across and above the engine then down the other side. The leak is in the middle at the highest point so the only way to fix it other than tape would be with a 50mm OD SS straight pipe stub in the middle and two clips. That will make it even less flexible than it is at the moment I think so I've rather discounted the idea.

Richard
Click to expand...

the main reason it is flexible is to get it in there in the first place, and to avoid a trade test in plumbing corners....
Now that you have the run laid in, a splint (the 50mm OD stainless stub) makes more sense.
 
Just renewed my injection bend and 1m of hose to the water lock, used ASAP's Seaflow and was delighted with it, realy flexible and so easy to put the new hose in compared with taking the old hose out.

Plank
 
Dougal Tolan said:
the main reason it is flexible is to get it in there in the first place, and to avoid a trade test in plumbing corners....
Now that you have the run laid in, a splint (the 50mm OD stainless stub) makes more sense.
Click to expand...

I might be being over-cautious but I'm also concerned that the place where the hose is leaking seems to be simply the result of the rubber perishing internally. The leak is on a straight run rather than a corner and not near one of the supporting cable ties so no friction. If it's perished in this unstressesd spot, how long before it goes somewhere else?

(and how long before the starboard engine hose goes as well :ambivalence:)

Until I get it out I'm not sure of the answers, if there are answers, to any of these questions. I would need to get it out to put in the splint as I would even be able to cut it where it's leaking.

Richard
 
Last edited:
RichardS said:
I might be being over-cautious but I'm also concerned that the place where the hose is leaking seems to be simply the result of the rubber perishing internally. The leak is on a straight run rather than a corner and not near one of the supporting cable ties so no friction. If it's perished in this unstressesd spot, how long before it goes somewhere else?

(and how long before the starboard engine hose goes as well :ambivalence:)

Until I get it out I'm not sure of the answers, if there are answers, to any of these questions. I would need to get it out to put in the splint as I would even be able to cut it where it's leaking.

Richard
Click to expand...

Sounds like a job for a well trained ferret. Mebby the perishing leak is due to a bit of extra heat off the top of the engine?
 
Well forget 2m ..... the damn thing is exactly 3m long and loops up high above the diesel filler pipe, the engine blower and the deck shower enclosure before coming back down to the skin fitting.

IMG_5465.JPG


At one point I was just going to abandon the struggle to get the thing out .... it's as stiff as a board ..... and just route the new hose well below it. I'm not sure why it loops so high up into the GRP moulding (it's as high as it can go and immediately under the deck) as my skin fittings are 2 foot above the waterline and this is a non-heeling cat so what are the chances of seawater finding it's way all the way back to the water trap anyway?

Anyway, now it's out I have the option of routing the new hose back up into the heavens or finding a new route, depending upon how flexible the new stuff is.

Thanks to all who gave an opinion but I wonder if anyone has directly compared the Seaflow hose with the Vetus 'cos I'd pay extra for extra flexibility. :)

Richard
 
Dougal Tolan said:
Is the loop up to deck level the anti siphon thingamy?
Click to expand...

Yes, I assume that it is. But how there's ever going to be a syphon when the skin fitting is 2 feet above the waterline and the boat doesn't heel is a bit beyond me at the moment. If someone has a theory about why the loop os needed in my situation then I'd be very pleased to hear it as that will persuade me that I have to persist in getting the new hose up where the old one was.

Richard
 
RichardS said:
Yes, I assume that it is. But how there's ever going to be a syphon when the skin fitting is 2 feet above the waterline and the boat doesn't heel is a bit beyond me at the moment. If someone has a theory about why the loop os needed in my situation then I'd be very pleased to hear it as that will persuade me that I have to persist in getting the new hose up where the old one was.

Richard
Click to expand...

Its a bypass, you have to build bypasses.
 
You must log in or register to reply here.

Share this page

Top